The force reports nominally to Iraq's Shiite-led government and has Iranian military advisers.
The officers, who spoke Sunday on condition of anonymity in line with regulations, say IS militants have deployed snipers, suicide vehicle bombers and suicide attackers on foot.
Lise Grande told the BBC residents were in grave danger as so-called Islamic State (IS) was directly targeting families.
Sha'aban Nasiri, a former major-general in Iran's Islamic Revolutionary Guard Corps, was killed in battle near Mosul, Joint Operation Command spokesman Col. Mohammed Ibrahim.
On Friday, the government dropped leaflets urging civilians to flee.
Indian Army not expecting 'limited war' with Pakistan
Is it what I am supposed to tell them as the chief? "I have to maintain the morale of my troops who are operating there", he said. But he also asserted that maximum restraint was being maintained while handling the deteriorating situation in the Valley.
Army, police and elite counterterrorism units began the assault on the edges of western Mosul's Old City before dawn, backed by USA -led coalition airstrikes and artillery. In Mosul, Iraqi forces are steadily closing in on remaining pockets of territory held by IS, but unlike past urban battles against them in Iraq, the militants still hunkered down in the city are mounting a stiff resistance, and the more the battle stretches out, the greater the risk for civilians remaining behind.
"The Iraqi government must ensure all exit corridors are genuinely safe for people to flee", it said.
Residents in the Old City sounded desperate in telephone interviews over the past few days. Since the Mosul operation was launched in October, Iraqi forces have encouraged civilians to remain in their homes to avoid massive displacement.
The United Nations has said the battle has left more than 8,000 civilians dead or wounded, but that figure only comprises people transferred to medical facilities.
On Saturday Iraqi forces launched an operation to capture the enclave, which includes the densely populated Old City center and three adjacent districts.
The United Nations said that "as many as 200,000 additional people may try to leave in coming days" and that both Iraqi forces and ISIS fighters are obligated under global law to protect civilians. ISIS fighters have utilized any dastardly advantage they can in an attempt to maintain their hold on western Mosul, including the use of human shields and suicide bombers.
The three neighbourhoods are seen as the last areas that separate Iraqi forces from ISIL's last bastion in Mosul's Old City.
The IRGC is the main backer of the Iraqi Shi'ite paramilitary force known as Popular Mobilisation. Iran has provided weapons, training and advisers credited with important early victories against the extremists in 2014 before the US began a campaign of airstrikes targeting the group.
Iraqi military commanders had expressed hope of taking control of the Old City's Grand al-Nuri mosque, from which Baghdadi declared the caliphate, before the fasting month of Ramadan, which starts on Saturday or Sunday in Iraq.
Guadalajara y Tigres deciden todo
La estadística dice que cuando Tigres ha empatado o perdido el partido de ida en esas finales, casi siempre se queda sin el título en disputa.
The following month, the coalition dropped 38% fewer munitions on Mosul , according to London-based monitoring group Airwars. However, more than 730,000 people have fled the fight to date according to United Nations figures.
They may have been opponents on the pitch, yet both deserve respect as fierce competitors and genuine greats of the modern era. Jones has started the last three games for United, but it is unsure whether he will start in Wednesday's final.
Prime Minister Theresa May said soldiers who have been patrolling streets would be withdrawn gradually from midnight Monday. Security is being increased at the football cup finals at Wembley Stadium in London and the Great Manchester Run.
The fastest has slowed down. "I am in a good position", he said, preparing to start 18 in the No.22 Team Penske Chevrolet. Despite having to face the powerful Honda engines, Power said he wasn't anxious about Sunday's race .
Trump on Thursday ordered an investigation of the leaks, saying they "pose a grave threat to our national security". But Mr Kushner's attorney Jamie Gorelick said his client "has no recollection of the calls as described".
One officer was airlifted to Jackson Memorial Hospital and the other was transported on the ground, both are in stable condition. Two Miami-Dade police officers were hospitalized Sunday morning after a wrong-way crash in Southwest Miami-Dade, police say.
Canada's Foreign Minister Chrystia Freeland speaks to journalists on Parliament Hill in Ottawa, Ontario, Canada May 18, 2017 . The letter did not, however, offer details about what the scope of these negotiations would include.
The French had already been on the water earlier in the day, providing little opposition for cupholders Oracle Team. Coutts is chief executive of Team Oracle, at the time Ainslie was understudy to the skipper Jimmy Spithill .
Grande also said "my heart, prayers and deepest condolences are with the victims of the Manchester attack and their loved ones". Peter's Square in prayer, saying he was "close to the relatives and all those who are weeping for the dead".
Police said on Saturday that Best died at the scene and that Meche died at a hospital after Christian slit their throats. The victims of Friday's fatal stabbing on a commuter train in Portland, Oregon , have been identified by the police .
Police arrests two more Manchester attack suspects
Police were warned about Abedi's "extreme and violent views" several years before Monday's deadly bombing, according to BBC News . Military personnel will remain ready to deploy in support of the police if needed, even after they stand down, Rowley said.
Hitman Franchise Not Necessarily Ending: Square Enix
But unlike previous titles, Final Fantasy VII remake and Kingdom Hearts III is being developed using the latest Unreal Engine. Square Enix has plenty of high profile titles in the works, but aside from Dragon Quest XI , they lack even a release window.
Vettel wins Monaco Grand Prix ahead of Raikkonen
Lewis Hamilton is starting the F1 Monaco Grand Prix from 13th place on the grid, but all is not lost for the three-time champion. Mercedes reacted immediately, pitting Bottas one lap later, with the Finn emerging from the pits ahead of his Dutch rival.
Chivas vs Tigres en vivo online: Final Liga MX
Con la igualada en el marcador daba la impresión que Tigres encontraría un tercer gol, pero Chivas volvió a replegarse para evitar que el marco de Cotta cayera por tercera ocasión en la final del 'ida'.